www.xtremepapers.com Cambridge International Examinations Cambridge International General Certificate of Secondary Education *7523218078* ENVIRONMENTAL MANAGEMENT 0680/21 Paper 2 May/June 2015 1 hour 45 minutes Candidates answer on the Question Paper. Additional Materials: Insert READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer both questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. The Insert is not required by the Examiner. This document consists of 15 printed pages, 1 blank page and 1 Insert. DC (KN/CGW) 91750/5 [Turn over
2 1 (a) Look at the climate graph for Aralsk, a town in Kazakhstan. Aralsk was on the northern edge of the Aral Sea. temperature / C 25 20 15 10 5 0 5 10 20 15 10 5 0 Key temperature precipitation precipitation / mm 15 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec months (i) Describe the climate of Aralsk....[4] (ii) Explain why the climate around Aralsk causes problems for farmers....[2]
(b) Look at the maps showing changes to the size of the Aral Sea from 1957 to 2007. N 3 Aralsk Aralsk Aralsk Aral Sea Aral Sea Aral Sea 1957 1984 2007 0 200 km Describe the changes to the Aral Sea from 1957 to 2007...................[3] [Turn over
4 (c) Two rivers flow into the Aral Sea. Both have been dammed and the water is mainly used to irrigate crops of cotton, rice and wheat. The percentage of the water taken from the rivers from 1960 to 2000 is shown in the table. year percentage of water taken 1960 45 1980 95 2000 90 (i) Complete a bar graph on the grid below to show the data in the table. Label the axes. (ii) In the year 2000, the total amount of water flowing down the two rivers was 120 km 3. Calculate how much of this water reached the Aral Sea. [4]... km 3 [1]
5 (iii) The Aral Sea is an inland sea with no rivers flowing out of it. Suggest why the level of the sea went down when water from the rivers was still flowing into it....[2] (d) Read the information below. Environmental disaster in the Aral Sea Large amounts of fertilisers and pesticides were used on irrigated crops. Some of these were washed into the rivers and into the Aral Sea. As the sea got smaller, it became increasingly salty. The reduction in the surface area of the sea altered the climate around the area. It has been described as an environmental disaster. (i) Describe and explain the problems that these changes would have had on the Aral Sea ecosystem....[5] (ii) Suggest how people living near the Aral Sea were affected by this environmental disaster....[3] [Turn over
(e) Look at Photograph A (Insert) of soil erosion on a hillside. 6 (i) Most of the natural vegetation has been cleared for grazing. What was the natural vegetation?...[1] (ii) Describe what has happened to the hillside shown in the photograph since the natural vegetation was cleared....[2] (iii) Explain two ways in which farmers can reduce soil erosion....[4] (iv) Explain why soil erosion is a serious problem....[3]
7 (f) Can agriculture become sustainable and still feed a growing human population? Explain your answer.....................................[6] [Turn over
2 (a) Read the four definitions of ecosystem terms. 8 W X Y Z A community of organisms, where each is eaten in turn by another. Organism that forms the base of a food chain by taking energy from the environment to create carbohydrates. The place where a population (e.g. human, animal, plant, microorganism) lives and its surroundings, both living and non-living. Total number of individual organisms of the same species living within a defined area. Match the following terms to their definitions, labelled W, X, Y, Z: term letter food chain... habitat... population... producer... [3]
(b) The graph shows climate data for a savanna region in southern Africa. 9 30 25 20 15 10 5 temperature / C Key temperature rainfall 80 0 rainfall / mm 70 60 50 40 30 20 10 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec months (i) Use the figures in the table to complete the climate graph. month Sep Oct Nov Dec average temperature / C 23 27 26 24 [2] (ii) Calculate the range of temperature.... C [1] (iii) Calculate how much rain falls in the driest three months....mm [1] (iv) State the season when the rainfall is lowest....[1] [Turn over
10 (v) Describe th e appearance of vegetation in this savanna area in March and in August. March... August... [3] (vi) Give one reason to explain the differences in savanna vegetation in this area, in March and August....[1] (c) Look at Photograph B (Insert), which was taken in the same area of savanna vegetation. (i) Suggest why the elephants have visited the area shown in the photograph....[1] (ii) Describe how the vegetation has been affected by the elephants....[1] (iii) Suggest what would happen to the ecosystem if the elephant population increased....[4]
11 (d) In some parts of Africa, elephants cause problems for farmers and villagers. They eat the crops and animal fodder and destroy fences used to keep animals secure. Their numbers have grown in recent years as they are protected and trade in ivory (from their tusks) has been banned for many years. Some villagers think that the number of elephants need to be reduced. Explain why the WWF (World Wide Fund for Nature) would oppose reducing the number of elephants.............[2] [Turn over
12 (e) Read the fact sheet about African elephant populations. African elephants used to live in most of Africa. It is thought there may have been as many as 3-5 million African elephants 80 years ago. Elephants were hunted for trophies and their tusks. In the 1980s, an estimated 100 000 elephants were killed each year and up to 80% of herds were lost in some regions. In Kenya, the population fell by 85% between 1973 and 1989. Hunting is now banned in most African countries, but elephants are still being killed illegally for their tusks for ivory. Today, there are fewer than 700 000 left. The map shows where African elephants are found today. In general, the elephant population is only increasing in the southern parts of Africa. N north Africa west Africa eastern Africa Tropic of Cancer Equator central Africa Tropic of Capricorn southern Africa Key regional boundary African elephant populations 0 700 1400 2100 2800 km
13 (i) How many African elephants are thought to be alive today?...[1] (ii) Describe the distribution of the elephant population in Africa....[3] (iii) Suggest why elephant numbers are increasing in southern parts of Africa, but decreasing in other parts of Africa....[3] [Turn over
14 (f) Look at the graph which shows world human population by world region from 1950 to 2050. population / billions 9 8 7 6 5 4 3 2 North America Europe South America and the Caribbean Africa and the Middle East Asia and Oceania 1 0 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 year actual predicted (i) State the world population in billions in 1950.... billion [1] (ii) State the predicted world population in billions in 2050.... billion [1] (iii) Identify the world region which has had the largest population since 1950....[1] (iv) Estimate how many years it took for the world population to increase from three billion to four billion.... years [1]
15 (v) Explain the rapid increase in world population since 1950....[3] (vi) Explain environmental problems that are caused by an increasing human population....[6]
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